LangChain offers several types of agents. Here's an example using one powered by OpenAI functions:

import CodeBlock from "@theme/CodeBlock";
import Example from "@examples/agents/openai.ts";

<CodeBlock language="typescript">{Example}</CodeBlock>

And here is the logged verbose output:

```shell
[chain/start] [1:chain:AgentExecutor] Entering Chain run with input: {
  "input": "What is the weather in New York?",
  "chat_history": []
}
[llm/start] [1:chain:AgentExecutor > 2:llm:ChatOpenAI] Entering LLM run with input: {
  "messages": [
    [
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "SystemMessage"
        ],
        "kwargs": {
          "content": "You are a helpful AI assistant.",
          "additional_kwargs": {}
        }
      },
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "HumanMessage"
        ],
        "kwargs": {
          "content": "What is the weather in New York?",
          "additional_kwargs": {}
        }
      }
    ]
  ]
}
[llm/end] [1:chain:AgentExecutor > 2:llm:ChatOpenAI] [1.97s] Exiting LLM run with output: {
  "generations": [
    [
      {
        "text": "",
        "message": {
          "lc": 1,
          "type": "constructor",
          "id": [
            "langchain",
            "schema",
            "AIMessage"
          ],
          "kwargs": {
            "content": "",
            "additional_kwargs": {
              "function_call": {
                "name": "search",
                "arguments": "{\n  \"input\": \"current weather in New York\"\n}"
              }
            }
          }
        }
      }
    ]
  ],
  "llmOutput": {
    "tokenUsage": {
      "completionTokens": 18,
      "promptTokens": 121,
      "totalTokens": 139
    }
  }
}
[agent/action] [1:chain:AgentExecutor] Agent selected action: {
  "tool": "search",
  "toolInput": {
    "input": "current weather in New York"
  },
  "log": ""
}
[tool/start] [1:chain:AgentExecutor > 3:tool:SerpAPI] Entering Tool run with input: "current weather in New York"
[tool/end] [1:chain:AgentExecutor > 3:tool:SerpAPI] [1.90s] Exiting Tool run with output: "1 am · Feels Like72° · WindSSW 1 mph · Humidity89% · UV Index0 of 11 · Cloud Cover79% · Rain Amount0 in ..."
[llm/start] [1:chain:AgentExecutor > 4:llm:ChatOpenAI] Entering LLM run with input: {
  "messages": [
    [
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "SystemMessage"
        ],
        "kwargs": {
          "content": "You are a helpful AI assistant.",
          "additional_kwargs": {}
        }
      },
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "HumanMessage"
        ],
        "kwargs": {
          "content": "What is the weather in New York?",
          "additional_kwargs": {}
        }
      },
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "AIMessage"
        ],
        "kwargs": {
          "content": "",
          "additional_kwargs": {
            "function_call": {
              "name": "search",
              "arguments": "{\"input\":\"current weather in New York\"}"
            }
          }
        }
      },
      {
        "lc": 1,
        "type": "constructor",
        "id": [
          "langchain",
          "schema",
          "FunctionMessage"
        ],
        "kwargs": {
          "content": "1 am · Feels Like72° · WindSSW 1 mph · Humidity89% · UV Index0 of 11 · Cloud Cover79% · Rain Amount0 in ...",
          "name": "search",
          "additional_kwargs": {}
        }
      }
    ]
  ]
}
[llm/end] [1:chain:AgentExecutor > 4:llm:ChatOpenAI] [3.33s] Exiting LLM run with output: {
  "generations": [
    [
      {
        "text": "The current weather in New York is 72°F with a wind speed of 1 mph coming from the SSW. The humidity is at 89% and the UV index is 0 out of 11. The cloud cover is 79% and there has been no rain.",
        "message": {
          "lc": 1,
          "type": "constructor",
          "id": [
            "langchain",
            "schema",
            "AIMessage"
          ],
          "kwargs": {
            "content": "The current weather in New York is 72°F with a wind speed of 1 mph coming from the SSW. The humidity is at 89% and the UV index is 0 out of 11. The cloud cover is 79% and there has been no rain.",
            "additional_kwargs": {}
          }
        }
      }
    ]
  ],
  "llmOutput": {
    "tokenUsage": {
      "completionTokens": 58,
      "promptTokens": 180,
      "totalTokens": 238
    }
  }
}
[chain/end] [1:chain:AgentExecutor] [7.73s] Exiting Chain run with output: {
  "output": "The current weather in New York is 72°F with a wind speed of 1 mph coming from the SSW. The humidity is at 89% and the UV index is 0 out of 11. The cloud cover is 79% and there has been no rain."
}
```